Figure 3.

Values of ${\tilde{D}}_{\mathrm{eff}}$ obtained for oblate spheroids with χ = 1/8 by homogenization method, plotted as a function of the obstacle volume density V. Solid and dashed curves are the plots of f_α,ϕc(ϕ(V))=(1−ϕ(V)^{∕ϕ_c)αϕ_c} and g_α(ϕ(V)) = (1 − ϕ(V))^α = e^−αV, respectively; α = 2.699 and ϕ_c = 1 − exp ( − 5/α). The error bars are comparable to the symbol size. Inset: a semilog plot of the same data.